Chain tightener



April 6 1926.

w. D. THOMPSON CHAIN TIGHTENER Filed July 2, 192;;

In 2/6 12/17 or ND. TZLOZIL/QSOIZ, 7

gages I the holes Pin the link D.

Patented Apr. 6, 1926'.

UNITED-STATES f I 1 579 579; A NT OFFICE.

WILLIAM DUNCAN THOMPSON, or 'roooooLnwnn, QUEENSLAND, AUSTRALIA.

01min TIGHTENER. I

Application filed July 2,

To-all who-m it may concern. 7 Be it known that I, WILLIAM DUNCAN TrIoMrsomsubject offthe King of Great Britain, resi'dingat Toogoolawah, Queensland, AustraIia haVe invented certain new and useful Improvements in Chain Tighten ers, of which the following is a specification. In the past it has been a somewhat difficult matterto strain non-skid chains onto motor car wheels, 'especiallywhen the car has been stuck up in a, soft 'place.',; The object of this invention lS'tO provide a mechanical strainer which makes the opera-' tion comparatively easy. It will be seen from the description, which follows that the appliance is adaptable for use in straining the wires of fences as a lifting jack, and for other like purposes. 7/

In carrying out myinvention I articulate two levers togetherby two links arranged in such a manner" that a comparatively-great strain is obtained by 'the'movement'of a.

single lever.

In order which Fig. 1 shows a simple arrangement 'mid open and partbroken off.

Fig. 2 shows the devi ing device thereon;

Fig. 3 shows the device mid open and with an alternative locking device.-

Fig.4: shows the device full open. I Fig. 5 shows the invention as applied to a lifting jack.

The'lever A is formed at oneend (not shown) as a handle or grip and the other end B is provided with a hole C for attachin the hook C efor engaging one end of a non-skid chain. A link D is pivoted at E to the lever A, and nearer to the handle'the link F is pivoted at G. Theselink's D F, which are of unequal length, and which cross each other, are pivoted .at H and J respectively to a lever K. This lever K-is also fitted at the end Witha holeL for attaching the hook L In Figs. 1 and 4, I show the leversA and K provided with a pin M for holding them in desired positions, which pin enthe hole N in the link F and'one of (See Fig. 1.)

In Fig. 2 the levers A and K are held in the desired position by the pawl Q on the lever A engaging the toothed sector R on levers A and K respectively.

d that my invention may be better understood I will now: describe same with the aid of the accompanying draw1ngs, 1n

ce closed and a lockv half inches.

' pivotJ of the link F and thus 1923. Serial No. 649,139.

the end of the link F. A spring S keeps the-pawl Q normally inengagement with the sector R. f

In Fig. 3, thelevers A and K are held in'the desired position by the pawl Q on the lever A engaging thetoothed sector It secured on the link F. The clip T on. the lever A guides thesector R and the spring S keeps the pawl Q-normally in engagement withthe sector It.

When it is desired to use the device for straining, wire toggle grips of ordinary construction or other devices would be attached to the levers A and K instead ofthe hooks C and L.

When the device is to be used as a lifting jack, shoes U V would be fitted to the to bind myself to any particularmeasurements of the various parts nor to the distance between the various centres, I give the followinginformation by way of guidance v Centres C to E of lever Acne and one half inches. I

Centres Although I do'not wish Centres H to link F three and three Centres J to L of lever K of'one inch. v

The details of construction may be varied to suit the ideas of manufacturers.

The operation of my invention is as fol lows I Supposing the device is being used for three quarters 'ends'C and L being at the extreme limit of their travel as shown in Fig. 4. On the.

E toG of lever A onejand one half inches. 7

J of lever K one'and one i 'st-rainlng non-skid'chains' on to motor velever-A being moved, it pivots at C drawing over the links D andF'. The link F pivots on G and draws on the lever K, which I v time, the action of the links D F is such that pivots at II on the link D. At the same the linkD seems to force the end H away from the lever A causing it to swing onthe hook L towards the hook C The result is that a very powerful leverage is obtained; 1 Having now particularly described and forcing the ascertained the nature of my said invention and in What manner the same is to be performed, I declare that what I claim is 1. A. pushing and pulling implement including a long manually operated lever provided at one end with means to engage the object to be manipulated, a short lever, crossed links arranged nefirthe lower end of the long lever, each of said links havingone 01 its ends pivotally connected to the long lever and its other end pivotally connected to the short lever, one of said links being connected to one end of the short lever. and means the other end of the short lever to engage the object to be manipulated.

2. A pushing and pulling implement ineluding along manually operated lever provided at one end With means to engage the object to be manipulated, a short lever, crossed links varranged near the lower end 'to the upper end otthe short lever, means at the other end of the short lever to engage the OlJjQCl) to be manipulated, and means for locking said links in various positions relatively to each other.

3. A pushing or pulling implement including a long manually operated lever, a short lever arranged adjacent to tne lower end of the long leveigcrossed links pivotally connected to both of said levers, and connecting elentlcnts carried by the lowerends of both levers to engagejthe parts which are to he moved relatively to each other. 7

In testimony whereof I affix my signature.

WILLIAM DUNCAN THOMPSON. 

